What are some alternatives?
When comparing SpeedFan and LAN Messenger, you can also consider the following products
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
Ruler - It's a screen ruler for Windows.
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
BeeBEEP - You can message and share files inside your intranet without a server.
iStat Menus - "An advanced Mac system monitor for your menubar."
Feem - Share files offline. No servers. No cloud. No limits.